from argparse import ArgumentParser
from typing import Any, Dict, List, Set

from django.core.management.base import CommandError

from zerver.lib.management import ZulipBaseCommand
from zerver.lib.topic_mutes import build_topic_mute_checker
from zerver.models import Recipient, Subscription, UserMessage, UserProfile

def get_unread_messages(user_profile: UserProfile) -> List[Dict[str, Any]]:
    user_msgs = UserMessage.objects.filter(
        user_profile=user_profile,
        message__recipient__type=Recipient.STREAM
    ).extra(
        where=[UserMessage.where_unread()]
    ).values(
        'message_id',
        'message__subject',
        'message__recipient_id',
        'message__recipient__type_id',
    ).order_by("message_id")

    result = [
        dict(
            message_id=row['message_id'],
            topic=row['message__subject'],
            stream_id=row['message__recipient__type_id'],
            recipient_id=row['message__recipient_id'],
        )
        for row in list(user_msgs)]

    return result

def get_muted_streams(user_profile: UserProfile, stream_ids: Set[int]) -> Set[int]:
    rows = Subscription.objects.filter(
        user_profile=user_profile,
        recipient__type_id__in=stream_ids,
        in_home_view=False,
    ).values(
        'recipient__type_id'
    )
    muted_stream_ids = {
        row['recipient__type_id']
        for row in rows}

    return muted_stream_ids

def show_all_unread(user_profile: UserProfile) -> None:
    unreads = get_unread_messages(user_profile)

    stream_ids = {row['stream_id'] for row in unreads}

    muted_stream_ids = get_muted_streams(user_profile, stream_ids)

    is_topic_muted = build_topic_mute_checker(user_profile)

    for row in unreads:
        row['stream_muted'] = row['stream_id'] in muted_stream_ids
        row['topic_muted'] = is_topic_muted(row['recipient_id'], row['topic'])
        row['before'] = row['message_id'] < user_profile.pointer

    for row in unreads:
        print(row)

class Command(ZulipBaseCommand):
    help = """Show unread counts for a particular user."""

    def add_arguments(self, parser: ArgumentParser) -> None:
        parser.add_argument('email', metavar='<email>', type=str,
                            help='email address to spelunk')
        self.add_realm_args(parser)

    def handle(self, *args: Any, **options: str) -> None:
        realm = self.get_realm(options)
        email = options['email']
        try:
            user_profile = self.get_user(email, realm)
        except CommandError:
            print("e-mail %s doesn't exist in the realm %s, skipping" % (email, realm))
            return

        show_all_unread(user_profile)